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Réponse :

Bonjour

Explications étape par étap

Exercice 9

7x +17 = 9x +29

7x -9x = -17 +29

-2x = +12

x = 12/-2 = -6

4x +15 = 7x +24

4x -7x = -15 +24

-3x = +9

x = -9/3

8x +26 = 5x +14

8x -5x = -26 +14

3x = -12

x = -12/3 = -4

23x +31 = 16x +17

23x -16x = -31 +17

7x = -14

x = -14/7 = -2

Exercice 10

8x -3 = 2x +9

8x -2x = +3 +9

6x = 12

x = 12/6 = 2

-x +8 = -4x +11

-x +4x = -8 +11

3x = +3

x = 3/3 = 1

3x +34 = 11x +10

3x -11x = -34 +10

-8x = -24

x = +24/8 = +3

-9x +3 = -4x +7

-9x +4x = -3 +7

-5x = 4

x = -4/5